In 2010, Jonathon Linton discusses the white paint debate in his blog (years ago when I took one of his classes). There are so many different whites to choose from, how do you know which ones to use? There is permelba white, zinc white, titanium white, underpainting white, and so on!
You need to read his blog post about white because Jonathon went through and tested many different whites!
He chose three of his top favorites based on how white the paint looked when it dried.
There is a followup article in Scientific American about the chemistry of oil painting. I had read this article and then found Jonathon's studio class which was near my job at the time. It was kismet! I needed this lesson on white too!